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The actress, 36, welcomed a daughter with her husband Piers Williams just in time for Mother's Day.

Taking to Instagram to announce the happy news, she shared an adorable picture of her baby's tiny hand in hers and her husband's.

She also shared a video on her post, encouraging people to donate to a charity that supports migrant children.

America wrote: "LUCIA MARISOL WILLIAMS arrived on May 4th to give me my Mother’s Day hugs and kisses herself. Mama, Dada & Big Brother are over the moon to welcome her bright light to our family.

Lucia was born just in time for Mother's Day (Image: Instagram)

"Quarantine may have canceled her Baby Shower but it didn’t stop us from collecting and delivering essential supplies to #YesWeCanMobileSchools - spaces for moms and children at the border to learn, play, and stay safe through these hard times.

"Dear friends, if you’re considering sending Lucia a gift, please donate to @yeswecanwf in her name. Or make a donation today in honor of the Moms you love! Visit www.yeswecan.world for more info.

"Thank you @elsamariecollins @evalongoria & @thisisabouthumanity for organizing the baby shower and donations! And thank you to to all my friends and loved ones who donated gifts to support these beautiful families! Enjoy the video of your gifts reaching families! #WelcomeLucia #FamilyOfFour #MayTheFourth #MothersDay"

America cradling her bump in February (Image: AFP via Getty Images)

She's now a mum of two (Image: Instagram)

America had announced her pregnancy on New Year's Eve, posting on Instagram: "Welcoming Baby #2 in 2020! Happy New Year from our wild & growing bunch."

The couple are already parents to son Sebastian, who goes by the nickname Baz.

The Superstore actress also spoke about her pregnancy in February, revealing she had been experiencing some nasty symptoms.

She said: "I would walk into the gym and nap for 10 minutes on the massage table before I started.

"Some weeks I’d only muster 1 workout or I’d miss the week entirely, but I refused to feel like I had failed. Through this pregnancy, I’m equally committed to feeling strong AND being kind to myself."